If you don't have a prescription for it, it's illegal.
The government knows what's best.
Don't know for sure, but I doubt it is a Schedule 1(?) controlled substance like narcotic drugs. Probably illegal to sell without a prescription but not illegal to posses or use. It's like taking someone elses blood pressure pills. And with Viagra, doctors give out free samples to patients without scrips all the time.
Again. in the People's Republic of Palm Beach County, there are people who's only job is catch Limbaugh doing anything and then issue press releases.
BTW. I wonder if his vacation was at the Hedonism resort in the Dominican and if so, why he came back with any little purple pills. ;~))